Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2011-02-24 — MI
Operator
Michigan Consolidated Gas Co (Michcon)
Cause
Material Failure Of Pipe Or Weld
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$79,507
Incident datetime
2011-02-24 12:57
Report number
Location
MI
Narrative
Leak discovered during routine facility checks by employees of operator and employees of another operator with facilities at same location. Potential likely causations (including failures in valve body bleed or grease/sealant line extension piping) investigated, but could not be confirmed. Decision made to isolate and reduce pressure in pipeline segment to allow further investigation. After isolating 2 adjacent valve sections and reducing pressure though flow to lower pressure system, impacted segment further isolated and remaining gas vented to atmosphere. Impacted segment was purged (gas to air) using air movers in anticipation of necessity to perform welding operations to complete repairs. Investigation through excavation revealed crack in 2 inch fillet weld at socket welded connection installed in 2007 as facility modification to allow liquid removal from low point in a non-piggable section of station piping. Ice from freezing of ground water in vicinity of leak (due to cooling of gas as a result of pressure reduction) impacted adjacent 2 inch piping (not related to siphon), prompting repairs to adjacent (nonleaking) 2 inch piping in addition to piping at location of leak. After repairs were completed and nondestructive inspections completed, line segment was purged (air to gas), pressurized and returned to normal operation.
Detailed record list
Report Received Date
2011-03-25 00:00:00
Iyear
2011
Report Number
20110033
Supplemental Number
15254
Report Type
Supplemental Final
Operator Id
12408
Name
Michigan Consolidated Gas Co (Michcon)
Operator Street Address
One Energy Plaza
Operator City Name
Detroit
Operator State Abbreviation
MI
Operator Postal Code
48226
Local Datetime
2011-02-23 11:12:00
Location Latitude
42.7870347
Location Longitude
-82.5285857
Nrc Rpt Num
968441
Nrc Rpt Datetime
2011-02-24 14:10:00
Commodity Released Type
Natural Gas
Unintentional Release
6013
Intentional Release
5049
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2011-02-25 12:00:00
Restart Datetime
2011-02-26 23:00:00
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2011-02-24 12:57:00
On Site Datetime
2011-02-24 12:57:00
On Off Shore
Onshore
Onshore State Abbreviation
Mi
Onshore Postal Code
48054
Onshore City Name
China
Onshore County Name
St. Clair
Designated Location
Milepost
Designated Name
59.00
Pipe Fac Name
Belle River Mills Compressor Station
Segment Name
36" Milford-Belle River Loop
Federal
No
Location Type
Operator-Controlled Property
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
105
Crossing
No
Pipe Facility Type
Interstate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Weld/fusion, Including Heat-Affected Zone
Weld Subtype
Fillet Weld
Installation Year
2007
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Crack
Class Location Type
Class 2 Location
Could Be Hca
No
Pir Radius
52
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
38500
Est Cost Intentional Release
32300
Est Cost Prop Damage
79507
Est Cost Emergency
0
Est Cost Other
0
Prpty
150307
Accident Psig
775
Mop Psig
1000
Mop Cfr Section
Not On Omb-Approved Form When Submitted
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Upstream Valve Type Ind
Remotely Controlled
Downstream Valve Type Ind
Automatic
Length Segment Isolated
87968
Internal Inspection Ind
No
Other Restrictions Ind
Yes
Operation Complications Ind
No
Pipeline Function
Transmission System
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
No
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
Investigation Status
No, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate)
Investigation Status Details
No unusual or abnormal operating conditions contributed to the incident
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Material Failure Of Pipe Or Weld
Cause Details
Design-, Construction-, Installation-, Or Fabrication-Related
Pwjf Failure Type
Design-, Construction-, Installation-, Or Fabrication-Related
Field Exam Ind
Yes
Fatigue Vibr Related
Yes
Failure Subtype
Mechanical Vibration
Additional Crack Ind
Yes
Additional Lack Fusion Ind
Yes
Collected Data Ind
No
Has Hydrtst Conduc Before Ind
No
Direct Asmnt Conducted
No
Non Destructive Exam Ind
No
Preparer Name
M****** R* L********
Preparer Telephone
313-389-7762
Authorizer Name
R***** H* F*********
Authorizer Telephone
313-389-7755
Narrative
Leak discovered during routine facility checks by employees of operator and employees of another operator with facilities at same location. Potential likely causations (including failures in valve body bleed or grease/sealant line extension piping) investigated, but could not be confirmed. Decision made to isolate and reduce pressure in pipeline segment to allow further investigation. After isolating 2 adjacent valve sections and reducing pressure though flow to lower pressure system, impacted segment further isolated and remaining gas vented to atmosphere. Impacted segment was purged (gas to air) using air movers in anticipation of necessity to perform welding operations to complete repairs. Investigation through excavation revealed crack in 2 inch fillet weld at socket welded connection installed in 2007 as facility modification to allow liquid removal from low point in a non-piggable section of station piping. Ice from freezing of ground water in vicinity of leak (due to cooling of gas as a result of pressure reduction) impacted adjacent 2 inch piping (not related to siphon), prompting repairs to adjacent (nonleaking) 2 inch piping in addition to piping at location of leak. After repairs were completed and nondestructive inspections completed, line segment was purged (air to gas), pressurized and returned to normal operation.
| Report Received Date | 2011-03-25 00:00:00 |
|---|---|
| Iyear | 2011 |
| Report Number | 20110033 |
| Supplemental Number | 15254 |
| Report Type | Supplemental Final |
| Operator Id | 12408 PHMSA Enforcement |
| Name | Michigan Consolidated Gas Co (Michcon) |
| Operator Street Address | One Energy Plaza |
| Operator City Name | Detroit |
| Operator State Abbreviation | MI |
| Operator Postal Code | 48226 |
| Local Datetime | 2011-02-23 11:12:00 |
| Location Latitude | 42.7870347 Google Maps OpenStreetMap |
| Location Longitude | -82.5285857 Google Maps OpenStreetMap |
| Nrc Rpt Num | 968441 NRC Report How to search |
| Nrc Rpt Datetime | 2011-02-24 14:10:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 6013 |
| Intentional Release | 5049 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2011-02-25 12:00:00 |
| Restart Datetime | 2011-02-26 23:00:00 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2011-02-24 12:57:00 |
| On Site Datetime | 2011-02-24 12:57:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Mi |
| Onshore Postal Code | 48054 |
| Onshore City Name | China |
| Onshore County Name | St. Clair |
| Designated Location | Milepost |
| Designated Name | 59.00 |
| Pipe Fac Name | Belle River Mills Compressor Station |
| Segment Name | 36" Milford-Belle River Loop |
| Federal | No |
| Location Type | Operator-Controlled Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 105 |
| Crossing | No |
| Pipe Facility Type | Interstate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Weld/fusion, Including Heat-Affected Zone |
| Weld Subtype | Fillet Weld |
| Installation Year | 2007 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Crack |
| Class Location Type | Class 2 Location |
| Could Be Hca | No |
| Pir Radius | 52 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 38500 |
| Est Cost Intentional Release | 32300 |
| Est Cost Prop Damage | 79507 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Prpty | 150307 |
| Accident Psig | 775 |
| Mop Psig | 1000 |
| Mop Cfr Section | Not On Omb-Approved Form When Submitted View CFR 49 §192 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Upstream Valve Type Ind | Remotely Controlled |
| Downstream Valve Type Ind | Automatic |
| Length Segment Isolated | 87968 |
| Internal Inspection Ind | No |
| Other Restrictions Ind | Yes |
| Operation Complications Ind | No |
| Pipeline Function | Transmission System |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | No |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| Investigation Status | No, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate) |
| Investigation Status Details | No unusual or abnormal operating conditions contributed to the incident |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Material Failure Of Pipe Or Weld |
| Cause Details | Design-, Construction-, Installation-, Or Fabrication-Related |
| Pwjf Failure Type | Design-, Construction-, Installation-, Or Fabrication-Related |
| Field Exam Ind | Yes |
| Fatigue Vibr Related | Yes |
| Failure Subtype | Mechanical Vibration |
| Additional Crack Ind | Yes |
| Additional Lack Fusion Ind | Yes |
| Collected Data Ind | No |
| Has Hydrtst Conduc Before Ind | No |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | No |
| Preparer Name | M****** R* L******** |
| Preparer Telephone | 313-389-7762 |
| Authorizer Name | R***** H* F********* |
| Authorizer Telephone | 313-389-7755 |
| Narrative | Leak discovered during routine facility checks by employees of operator and employees of another operator with facilities at same location. Potential likely causations (including failures in valve body bleed or grease/sealant line extension piping) investigated, but could not be confirmed. Decision made to isolate and reduce pressure in pipeline segment to allow further investigation. After isolating 2 adjacent valve sections and reducing pressure though flow to lower pressure system, impacted segment further isolated and remaining gas vented to atmosphere. Impacted segment was purged (gas to air) using air movers in anticipation of necessity to perform welding operations to complete repairs. Investigation through excavation revealed crack in 2 inch fillet weld at socket welded connection installed in 2007 as facility modification to allow liquid removal from low point in a non-piggable section of station piping. Ice from freezing of ground water in vicinity of leak (due to cooling of gas as a result of pressure reduction) impacted adjacent 2 inch piping (not related to siphon), prompting repairs to adjacent (nonleaking) 2 inch piping in addition to piping at location of leak. After repairs were completed and nondestructive inspections completed, line segment was purged (air to gas), pressurized and returned to normal operation. |
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